P0734: Gear 4 Incorrect Ratio
What Does P0734 Mean?
P0734 is a diagnostic trouble code indicating: Gear 4 Incorrect Ratio. This code relates to the transmission system. It has been reported in NHTSA complaints across 4 different vehicle models.
The automatic transmission is controlled by the TCM using input from speed sensors, temperature sensors, and pressure sensors. When the TCM detects a fault, it may activate limp mode (2nd or 3rd gear only). Shift solenoids are electromagnetic valves inside the valve body controlling hydraulic fluid flow. Modern transmissions use 4-8 solenoids in combination for each gear. Solenoid failures are often caused by contaminated fluid — worn clutch material and degraded fluid create varnish that sticks solenoids. Always check transmission fluid first: level, color (red/pink good, brown/black bad), and smell (burnt = internal damage). Transmission DTCs escalate fast — a $200 solenoid fix can become a $3000-$5000 rebuild if ignored.
Symptoms of P0734
- ⚠️ Check engine/transmission warning light on
- ⚠️ Harsh, delayed, or erratic shifting
- ⚠️ Transmission stuck in one gear (limp mode)
- ⚠️ No upshift or no downshift
- ⚠️ Transmission slipping
- ⚠️ RPM flares between shifts
Common Causes
- 🔍 Faulty shift solenoid
- 🔍 Contaminated transmission fluid
- 🔍 Wiring issue between TCM and solenoid
- 🔍 Valve body wear
- 🔍 TCM internal failure
P0734 Reports by Year
Real Owner Reports
From NHTSA complaint database — actual owner descriptions.
"WHILE NORMALLY ACCELERATING FROM STOP, VEHICLE REACHED 4000 RPM THEN SHIFTED VERY HARD, DRIVER AND ALL PASSENGERS EXPERIENCED A JOLT. THE VEHICLE WAS TAKEN TO A SHOP FOR DIAGNOSIS. THE DIAGNOSIS REVEALED CODES P0732 & P0734 - CD4E TRANSMISSION. THE SHOP MANAGER EXPLAINED THAT THE VEHICLE HAS TRANSMI"
— Ford Escape owner, 10/09/2014
"Vehicle warning indicated to restart car. Pulled over and car did not restart. Dealership indicated that the power steering belt broke the crank sensor on the motor and if the sensor was broke it would not start. They stated that they wouldn’t look for any other issues if it was the sensor that w"
— Ford Escape owner, 06/03/2022
"While driving my car started skipping from first to second gear and then lowering acceleration. When at a complete stop car would not accelerate and just revs through first and second gear making a pinging clicking sound. Brought to dealership to be told codes p0702 and code p0734 were reading. I've"
— Ford Focus owner, 01/10/2025
Source: NHTSA Complaints Database
Most Reported Vehicles for P0734
Based on NHTSA owner complaint data.
| # | Vehicle | Reports |
|---|---|---|
| 1 | FORD ESCAPE | |
| 2 | FORD FOCUS | |
| 3 | DODGE JOURNEY | |
| 4 | CHRYSLER 200 |
P0734 Reports by Vehicle
Detailed NHTSA complaint analysis for each vehicle model.
Diagnostic Tips
- Check fluid level and condition FIRST
- Multiple codes suggest valve body or internal damage
- Monitor solenoid duty cycle with scan tool
- Solenoids often accessible by removing pan
Common Mistakes to Avoid
- ❌ Replacing solenoid without flushing contaminated fluid
- ❌ Using aftermarket fluid instead of manufacturer-specified
- ❌ Driving in limp mode for extended periods
Frequently Asked Questions
What is a shift solenoid?
Can I drive in limp mode?
How much for solenoid replacement?
Can fluid change fix it?
What To Do Next
Possible Fixes
- 🔧 Replace shift solenoid or pack
- 🔧 Transmission fluid flush with manufacturer fluid
- 🔧 Repair wiring to transmission
- 🔧 Replace valve body
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1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
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Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.